United secured a 2-1 victory at the Hawthorns on New Year's Day but the Baggies could well have taken a point, with Peter Odemwingie missing a second-half penalty after Ferdinand had brought down Jerome Thomas.
However, the United defender insists he is unconcerned by the performance itself as long as his side come away with all three points.
Ferdinand told Sky Sports 2: "You've got to win games. I don't care how we win. The three points is all that counts.
"You've got to dig deep in these games and these are the type of games you can make up a lot of ground in the league."
Boss Sir Alex Ferguson hailed the victory as a "massive result" and admitted United, who remain at the top of the table after their victory at West Brom, had to fight hard to secure the win.
"It's a massive result for us today. Over the years we've had to battle out games and we have had to do that today," said Ferguson.
"In the second half we started to play a bit better. We had to make changes with one or two injuries."